Ballast and projector

Details Ballast and projector Ballast and projector

2006-05-30

2008-10-21

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S224000

Reexamination Certificate

active

07439681

ABSTRACT:
The disclosure is directed to a ballast and a projector. In one embodiment, a ballast comprises an igniter circuit. The igniter circuit is configured to apply a first voltage and a second voltage having opposite polarities to a base electrode and a leading electrode of a high-pressure discharge lamp. At a start of a lighting of the lamp an absolute value of the first voltage applied to one of the electrodes of the lamp is larger than an absolute value of the second voltage applied to the other of the electrodes of the lamp.

REFERENCES:
patent: 6104147 (2000-08-01), Nakamura et al.
patent: 6483257 (2002-11-01), Henderson et al.
patent: 2003/0122505 (2003-07-01), Huber et al.
patent: 2005/0140311 (2005-06-01), Suzuki et al.
patent: 2007/0228997 (2007-10-01), Hirschmann et al.
patent: 2003-316440 (2003-11-01), None
patent: 2003-151786 (2005-05-01), None

Affiliated with

Also associated with

Rating

Ballast and projector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Ballast and projector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ballast and projector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3998893